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Goodwill by Business Segment (Detail) - USD ($) $ in Thousands		12 Months Ended
		May 31, 2022	May 31, 2021
Goodwill [Line Items]
Beginning Balance		$ 131,476	$ 110,340
Goodwill acquired		15,904	18,775
Goodwill and/or currency adjustments	[1]	(4,676)	2,361
Ending Balance		142,704	131,476
Food Safety
Goodwill [Line Items]
Beginning Balance		67,822	47,215
Goodwill acquired		4,152	18,775
Goodwill and/or currency adjustments	[1]	(4,416)	1,832
Ending Balance		67,558	67,822
Animal Safety
Goodwill [Line Items]
Beginning Balance		63,654	63,125
Goodwill acquired		11,752	0
Goodwill and/or currency adjustments	[1]	(260)	529
Ending Balance		$ 75,146	$ 63,654
[1] Includes final purchase price allocation adjustments and currency adjustments for goodwill recorded at international locations.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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